Do you consume caffeine? Caffeine can stay in your system for 10+ hours after you consume it. For many people it lasts longer.
If caffeine might be the cause you can try Rutaesomn. It is a natural sleep aid that speeds up the body's natural process in eliminating caffeine. This allows you to continue your caffeine consumption lifestyle and still get the sleep you need when you need it.
Sleepless nights affect the brain and how it functions, because of fatigue. The right amount of sleep results to good health as it makes the body function normally. Sometimes it is caused by the things you take at night such as coffee and sugary staff, seeing the doctor is the best thing to do.